Greaseproof folding box



Jan. 30, 1945. D. LEVKOFF I GREASEPROOF FOLDING BOX Filed June 24, 19422 Sheets-Sheet l INVENTOR. 0A W0 LEV/(OFF: BY

@ fflmw A TIORNEYS Jan. 30, 1945. D. LEVKOFF GREASEPROOF FOLDING BOXFiled June 24, 1942 2 Sheets-Sheet 2 INV ENT OR. 5 VAOFF 04 W0 L NATTORNEYS.

Patented Jan. 30, 1945 2,368,553 GREASEPROOF FOLDING BOX David Levkofl,Brooklyn, N. Y. Application June 24, 1942, Serial No. 448,252 -1 Claim.(Cl. 229-48) This invention relates to improvements in foldlng cardboardboxes, and more specifically to a grease-proof box for the packaging ofgreasy products.

In the packaging of food products such as butter, lard, bacon, and othergreasy products in cardboard boxes, the outer surface of the box becomessoiled, in spite of the grease-proof coating applied to the inner wallsof the box. This condition is caused by raw edges of the cardboardmaterial coming in contact with the greasy contents of the box, the saidraw exposed edges absorbing the grease which accordingly spreads overthe outer surface of the box, thus imparting an unsanitary appearance tothe package which causes an otherwise attractive packaged product tolose its sales appeal. It is therefore the main object of this inventionto isolate the raw edges of the folding cardboard box from the greasycontents of the box by a novel construction which causes all the rawedges of the box to be disposed exteriorly thereof.

Another feature of the invention is to provide a folding cardboard boxhaving novel infolding reinforced end wall structures having interlock.-ing means for securing the same in closed folded position.

A further feature of the invention is to provide a foldinggreaseproof-cardboard box which is simple and inexpensive ofconstruction; which may be cut from cardboard stock with a minimum ofwaste, and which maybe quickly and easily set up for use.

Other novel features of the invention will be come apparent as thefollowingspecification is read in conjunction with the accompanyingdrawings, in which:

Figure 1 is a perspective view of the grease- I proof box in closed setup position.

Figure 2 is a perspective view of the top end of the box with thelocking flap and one of the wing flaps in opened out position, thedotted lines indicating the position of the wing flap in infoldedposition.

Figure 3 is a detail perspective view of the end closure constructionpartially folded.

Figure 4 is an enlarged horizontal sectional view on the line 4-4 ofFigure 1.

Figure 5'is an enlarged vertical sectional view on the line 5-5 ofFigure 1 with the locking flap in a raised unlocked position.

Figure 6 is an enlarged vertical sectional view on the line 5-5 ofFigure 1.

Figure '7 is an end elevational view of the box after glueing and beforesubsequent folding to set up position.

Figure 8 is a plan view of the blank from which the box is constructed.

Figure 9 is a detail horizontal sectional view embodying the greaseproofseam in a container which is round in cross section.

Referring to the drawings by reference characters. the numeral l0designates a substantially rectangular blank of cardboard (Figure 8)which is scored and folded in a novel manner to form a box in which alledges of the blank are disposed exterlorly of the box. The inner surfaceof the blank I0 is provided with a greaseproof and molstureproof coatingsuch as parafflne, or the inner surface may have a lamination ofCellophane or other sheet material having similar characteristics.

The cardboard blank shown in Figure 8 ,is scored vertically on thespaced parallel lines ll, l2, I3, I 4, and I5, reading from left toright, and is scored transversely equi-distantly from the top and bottomedges and parallel thereto on the. score lines lG-IS. The materialbounded by the scores Iii-l6 and the top and the respective adjacentbottomedges of the blank form the foldable top and bottom end wallstructures A and A respectively, and the remaining material, that is,the material between the scores Iii-i6 form the four side wall panelsdesignated l1, l8, l9, and 20. The material between the score H andadjacent vertical side of the blank constitutes a glue flap 2|, and thematerial between the score l5 and other vertical edge of the blankconstitutes a reenforcing flap panel 22.

In view of the fact that the top and bottom end wall structures A and Aare identical in construction a description of one will suflice for theother and like reference characters refer to similar parts. Each endwall structure includes an inner end wall panel C bounded by the scoresl6, l2, and I 3 and a score 23 disposed in alinementwith the end edge ofthe blank and which separates the panel C from an outwardly extendingrectangular locking flap 24. The flap 24 has its side edges providedwith opposed notches 25 adjacent its outer free end and which notchesform locking tongues 26. Disposed at opposite sides of the end wallpanel C are folding wing tab panels D and E respectively. The panel D isbounded by the scores ll, I2, l6, and the end edge of the blank. Thepanel E is bounded by the scores l3, l4, and I6 and end edge of theblank. Each panel D and E is divided into four triangular shapedsections 21, 28, 29, and 30. by

crossed diagonal score lines 3| and 32. The section 2 is further dividedby a vertical score 33 extend inwardly from the end edge of the blankand terminating at the intersection of the crossed scores 3! and 32. Thesection 21 is further divided by a vertical score 33 extending inwardlyfrom the end edge of the blank and terminating at the intersection ofthe crossed scores 3| and 32. The inner ends of the scores are joined bya" transverse score 3.4 which extends entirely across the panel C todivide it into a top wall section 35 and a bottom wall section 86 andwhich divides the triangular section 30-30 of the panels D and E intotwo additional triangular sections 30a and 303. An outer end wall panelF is disposed adjacent the panel E and is bounded by th scores ll, l6,l5, and the end edge of the blank.

After the blank ID has been cut and scored in the manner hereinbeforedescribed, the same is passed through a box folding and giueing machineto first apply glue 31 to the outer surface of-the fold flap panel 22along the entire length thereof, after which the panel 22 is foldedoutwardly and inwardly on the score I flat against the side wall paneland outer and inner end wall panels A and B, so that the free side edgeof the panel 20 is defined by the fold G and the raw side edge of thefold flap 22 .is disposed exteriorly of the panel wall 20. Glue 38 isapplied along the length of the inner side of the glue flap 2| and theblank further folded upon the scores l2 and M, with the flap 2! flatlyoverlapping the glued foid flap 22. The flap 2! is of less width thanthe flap 22 so that its raw edge terminates short of the correspondingedge of the flap 22 and thereby forms a fiat stepped seam. The box isnow in the flat condition shown in Figure 7, and it leaves the boxfactory in this condition for compact stacking, shipping, and storing,for the subsequent folding is done at the location of use of the box andwhich may be accomplished by hand or by suitable box set-up machinery. 7

Assume that, the box is to be set up for use from the flat collapsedposition shown in Figure 7. The side wall structure is opened up todispose the side wall panels !'i--I9 and iii-20 in respective opposedrelation, and in view of the fact that the bottom end wall structure Aforms the bottom of the box, it is first folded and secured byinterlocking means. After the bottom wall is formed, the box is packedwith whatever commodity is to be packaged therein, after which, the topend wall structure A is folded closed and held by interlocking means.The end wall struc: tures A and A being identical in construction, thefolding of one of them to closed position will suflice for the other inorder to avoid a lengthy repetition of description.

. To effect a folding of either end wall structure to closed position,the side wall structure is opened up as previously mentioned, afterwhich the inner end wall panel C is folded inwardly on the score 16. Asthe panel C swings inwardly, it causes the wing flap panels D and E tofold outwardly on the scores 33 and those portions of the scores 3| and32 which bound the triangular sections 29. This initial infolding causesthe end wall panel C to swing inwardly on the score I6 so that the endwall structure now assumes the position shown in Figure 3. By furtherpressure upon the section 36, the same is moved to a horizontalposition, at which time the end wall section folds cu twardly on thescore 34 and is folded flat against the adjacent wall section 33 asillustrated in Figure I. As the section 35 moves to an overlappingposition relative to the section 36, the triangular sections 300. foldagainst the adjacent sections 303 and the outer end wall panel F foldsflat against the section 35 of the folded panel C. The folded wing tabpanels D and E extend substantially vertically beyond the plane of theside wall panels i1 and i9 respectively, as shown at the left in Figure2, and said wing tab panels are now folded inwardly over the top wallpanel F as shown at the right of Figure 2 in full lines and at the leftin dotted lines. When the folded wing tab panels are folded inwardly toth position just described, the triangular sections 28 thereof and theend wall panel F form pockets P, and these pockets respectively receivethe tongues 26 by folding the locking flap 24 down over the folded wingpanels D and E. Until the locking flap 24 is swung inwardly over thefolded wing panels D and E, the folded end wall structure has aninherent tendency to open up, but when the tongues 26 are flexed andinserted into the respective pockets P, the end wall structure issecurely held in closed folded position. However, access to the contentsof the closed box is easily obtained by withdrawing the tongues 28 fromthe pockets P and then spreading the several folded panel sectionsapart.

From the foregoing, it will be noted that no raw cardboard edges of theset up box are disposed inwardly of the box. The glue seam connectingthe meeting edges of the side wall structure is provided with theexteriorly folded flap 22 which forms the inner exposed fold edge G.Also, the end closure structure is free of any internal raw edges of thecardboard material, and therefore, the raw edges are not exposed to anygreasy or moist contents of the box, for the reason that the panel Cwhen folded upon itself provides an inside fold edge G and which isoverlapped by the flat panel E,- the raw edges of which are protected bythe folded panel C and infolded wing panels D and E. Thus, the soilingof the box by grease or moisture picked up by raw edges of thegreaseproof lined box is prevented when greasy or moist commodities arepackaged in the box.

In Figure 9 I have illustrated the greaseproof glue seam embodied in acardboard container body 40 which is round in cross section. One sideedge of the cardboard is folded upon itself as at M and glued togetheras at 42. The other side edge of the material overlaps the foldedportion 4| and is glued thereto as at 43. Thus the greaseproof seam maybe provided on a greaseproof lined container of shapes other thansquare.

If desired, the locking flap panels 24 may be dispensed with and gluelabels pasted over the infolded wing flap panels D and E. Also, ifdesired, the wing flaps D and E may be folded downwardly on the scoreline Hi to lie flat against the respective side walls I! and i9, andheld by an outer wrapper, in which instance the locking flap panel isdispensed with.

While I have shown and described what 1 consider to be the preferredembodiment of my invention for improvements in folding boxes, I wish itto be understood that such changes in design, shapes, and materials ascome within the scope of theappended claim may be resorted to githoutdeparting from the spirit of the inven- Having thus described theinvention, what I claim as new and desire to ecure by Letters Patent is:

In a container formed from a single rectangu lar blan oi cardboard, saidblank being hingescored 0 spaced parallel lines to provide a glue flapon one side edge of the blank, a reentorcing that side wall panel towhich it is hlngedly connected, an adhesive bond between the confrontingcontacting surfaces of the reeni'orcing panel and adjacent the side wallpanel, said blank being folded on the remaining hinge scores to positionthe side wall panel into their respective wall-forming positions, saidglue flap overlapping the side wall reeni'orcing panel with the foldededge of the-reeniorcing panel positioned in coinciding relation with thehinge score of the glue flap, and an adhesive bond between the glue flapand that portion of, the reenforcing panel which it overlaps, whereby toprovide a flat stepped reentorced seam along the length of thecontainer.

DAVID LEVKOFF.

